I think merging two requests opens up whole can of worms. 200+403 merged translates to 206? There is also content length merging. Wondering what would the rest

I think merging two requests opens up whole can of worms. 200+403 merged translates to 206? There is also content length merging. Wondering what would the rest of the headers translates to. If I respond with a header saying that the stream is EOF in the second call, would that be preserved.